MST™ Flat-Top Cryogenic Vial Caps — HDPE, Green, 200/Bag (300-3910-FG20)
These green High-Density Polyethylene (HDPE) flat-top cryogenic vial caps are purpose-built for Caplugs® Evergreen MST™ cryogenic vials, rated for both LN₂ vapor-phase and full immersion storage at -196°C as well as -80°C mechanical freezer use. Supplied 200 per bag under part number 300-3910-FG20, the green color supports specimen-type or batch color coding across multi-category cryo box programs, while the distinctive flat-top profile sets MST™ caps apart from CryoSure® dome-top caps — the two formats are not interchangeable.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 300-3910-FG20 |
| Sub-brand | MST™ (Caplugs® Evergreen) |
| Cap Profile | Flat Top |
| Material | High-Density Polyethylene (HDPE) |
| Color | Green |
| Cryo Rating | LN₂ vapor phase and immersion (-196°C) |
| Freezer Storage | -80°C compatible |
| Autoclave Compatibility | 121°C / 15 psi |
| BPA / Phthalates | BPA-free; no phthalate plasticizers |
| Pack Size | 200/Bag |
| Country of Origin | USA (California) |
Applications
- LN₂ vapor-phase biobank archiving of clinical and research specimens at -196°C
- Ultra-low temperature (-80°C) mechanical freezer biorepository storage with reliable freeze-thaw cycling performance
- Color-coded cryo box organization — green caps distinguish a specific donor cohort, collection event, or specimen sub-type within multi-category programs
- High-density cryo box stacking programs where the flat-top profile improves box-on-box stability versus dome-top caps
- Automated robotic cap-on/cap-off workflows where the flat profile enables consistent, repeatable robotic engagement
- DMSO-cryoprotected cell line cryopreservation archives
- Replacement cap supply for existing MST™ vial inventories with lost or damaged caps
Compatibility
The 300-3910-FG20 flat-top cap is designed exclusively for Caplugs® Evergreen MST™ cryogenic vials. The MST™ thread geometry and flat-top profile are specific to the MST™ vial format and are not interchangeable with CryoSure® vials, which use a dome-top cap with a different thread. Laboratories running mixed MST™ and CryoSure® cryo box programs should note this distinction carefully. If you are replacing caps for an existing MST™ vial collection, validate fit with a sample pack before committing to a bulk order. Green is one of 12 available MST™ cap colors — all supplied in the same 200/Bag format — allowing procurement teams to standardize pack size while assigning colors to specific specimen categories or study cohorts.
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Liquid nitrogen — vapor phase and immersion (-196°C) | Excellent — engineered for LN₂ service |
| Mechanical freezer storage (-80°C) | Excellent — HDPE cryo-toughened |
| Autoclave (121°C / 15 psi) | Compatible |
| DMSO at standard cryo concentrations (5–10%) | Good |
| Aqueous cryoprotectants (FBS, glycerol, Bambanker) | Excellent |
| Aqueous buffers and saline | Excellent |
| Concentrated organic solvents | Not recommended |
Quality & Procurement
Made in USA at Caplugs® Evergreen's California facility, these MST™ cryogenic caps are manufactured from BPA-free, phthalate-free HDPE resin. LabSupplies.com is an authorized Caplugs® Evergreen dealer, shipping from USA inventory with tiered pricing available for high-volume biobank, biorepository, and institutional procurement programs. All 12 MST™ cap colors share the same 200/Bag pack size, making it straightforward to standardize ordering quantities across your complete color-coding scheme.
Frequently Asked Questions
Can these caps be used with CryoSure® cryogenic vials?
No. MST™ flat-top caps and CryoSure® dome-top caps have different thread geometries and profiles and are not interchangeable. These caps are designed exclusively for MST™ cryogenic vials from Caplugs® Evergreen.
Are these caps safe for full LN₂ immersion, or only vapor-phase storage?
The HDPE construction is rated for both LN₂ vapor-phase (-196°C) and full immersion service, as well as -80°C mechanical freezer storage.
Can these caps be autoclaved before use?
Yes — HDPE is autoclave-compatible at standard conditions of 121°C / 15 psi, making pre-sterilization straightforward for applications that require it.
Are these caps available in other colors for color-coded cryo box programs?
Yes. The MST™ cap range includes 12 colors — all supplied in the same 200/Bag format — so procurement teams can order multiple colors to designate different specimen types, donor cohorts, or collection events within a single cryo box program.